Taxi app Free Now has acknowledged that some of its drivers continue to await payments that were due last week.
The delay was caused by a technical glitch at a third party company that manages payment services on behalf of Free Now.
The firm gave an assurance to Free Now that the problem was resolved and processing would resume over the weekend.
But in a statement Free Now said it understands that not all payments have been processed to every driver.
"We appreciate this puts drivers in an extremely difficult situation and so in parallel, we have put in place a contingency plan internally to ensure that drivers are paid the outstanding amount as soon as possible, regardless," a spokesperson for Free Now said.
"Tomorrow's usual payment run will include the 20% top up bonus we implemented over the weekend as a goodwill gesture to drivers."
"Needless to say, we are changing the third party provider immediately as this delay and misinformation is totally unacceptable."
The taxi app, owned by BMW and Daimler, thanked drivers for their patience and said it appreciates that the situation is unacceptable.
However the drivers, many of whom are now owed up to two weeks worth of debit and credit card fares booked using the app, are growing increasingly frustrated with the situation.
One told RTE News that he was owed €400, but others are owed more.
14,000 taxi drivers in Ireland use Free Now to take bookings.